Electromagnetic motive means



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ELECTROMAGNETIC MoTIvE MEANS Filed Oct. 1, 1942 '7 Sheets-Sheet 1 SemRam Dec. 19, 1944. F. c. FISHER 2,365,632

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ATTORNEY DeC- 19 1944- F. c. FISHER 2,365,632

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the solenoid windings and the plunger.

DEETCH acum UNITED STATES PATENT GFFICE ELECTROMAGNETIC' MOTIVE MEANSFrederick C. Fisher, Bellmore, N. Y., assgnor to ElectronoidCorporation, a corporation of New York Application October 1, 1942,Serial No. 460,398

21 Claims.

invention relates to electro-magnetic This motive means which, whileuseful for other purposes, is intended primarily for operating the Thisapplication is a continuation in part of my application, Ser. No.300,018, filed October 18, 1939, now Patent No. 2,303,263, Nov. 24,1942.

The electro-magnetic motive means of the present invention is, ingeneral, of the type disclosed in my said application Ser. No. 300,018and in accordance with the present invention and pursuant to one of theobjects thereof, the solenoid windings are energized in the propersequence by means controlled by the relative movement between thesolenoids and the solenoid plunger and operable in such manner as toeliminate the use of switch operating mechanisms. More specically, inaccordance with the present invention the solenoids are connected to anddisconnected from the line at the proper times by electrically operatedrelays, the operation of which are electrically controlled by currentvarying means whereby to produce a relative movement of the solenoidsand their plunger, the movement of the solenoids or their plunger asthecase may be being smooth and continuous and of the length of travelnecessary for actuating the device operated thereby.

Also, in accordance with the present embodiment of the invention, thecontinuous relative movement of the solenoids and plunger is obtained byspacing the solenoids, longitudinally of the solenoid plunger, one-thirdof the axial length of a solenoid winding, the axial lengths of thesolenoid windings being equal and the magnetic and non-magnetic sectionsof the plunger being each equal to the axial length of the solenoidwinding. This enables the solenoids to be spaced more closely than inthe apparatus disclosed in my above mentioned application while at thesame time obtaining the smooth and continuous relative movement of Thisconstitutes another object of the present invention.

A further object of the invention is to provide an electro-magneticallyoperated device which operates under the control of current varyingmeans which is responsive to the action of an iron core or plunger. Inaccordance with this object of the invention and pursuant to one formthereof, the current varying means is a reactance device including areactance coil, the inductance reactance of which is increased when saidcore is entered into said Winding; and pursuant to another form of theinvention, the current varying means is a transformer in which thesecondary current is increased when the iron core is entered into thetransformer winding.

In accordance with a more specific object of the invention, the ironcore which forms a part of the current varying means is operated by oneor more solenoids, preferably but not necessarily as part of thesolenoid plunger, and the electromagnetically controlled means whichoperates under the control of the current varying means controls, inturn, the operation of the solenoid or solenoids.

Another object of the invention is, more generally, to control therelative movement between the relatively movable parts of anelectrodynamic device by current varying means such as reactance meansor electric transformers.

The above and other objects, features and advantages of this inventionwill be fully understood from the following description, considered inconnection with the accompanying illustrative drawings.

In the drawings:

Fig. l is a perspective view of the electromagnetic motive means of thepresent invention operatively connected to the door of an elevator cabfor operating the same;

Fig. 2 is a side view in elevation, with parts in section, of the motivedevice;

Fig. 3 is a top plan view of the device, the top of the casing beingremoved, and parts of the top of the casing being cut away for thepurpose of illustration;

Fig. 4 is an end view of the device, seen along the line 4--4 of Fig. 2,when the end closure of the casing is removed;

Fig. 5 is an exploded perspective View of the parts of the reactancestructure;

Fig. 6 is a transverse sectional view of the reactance structure;

Figs. 7 and 8 are end and top views, respectively, of the solenoid;

Fig. 9 is a side view of the plunger, parts being broken away for thepurpose of illustration;

Fig. l0 is a sectional view of the plunger on the line lil-I0 of Fig. 9;

Figs. l1 to 16, inclusive, are diagrammatic views illustrating theoperation of the motive device of the present invention;

Fig. 1'7 is a more or less diagrammatic view of the motive device and ofthe electric circuit;

Fig. 18 is a circuit diagram similar to Fig. 17, illustrating amodification;

Fig. 19* is a side view of a control relay of the type utilized in thecircuit shown in Fig. 18;

Fig. 2O is a front view of the relay shown in Fig. 19;

Figs. 21 to 26, inclusive, are diagrammatic views similar to Figs. 11 to16, inclusive, illustrating another form of the invention;

Fig. 27 is a circuit diagram of the form of the invention illustrated inFigs. 21 to 26;

Fig. 28 is a transverse sectional view, on a larger scale, on the line28-28 of Fig. 3;

Fig. 29 is a sectional View on the line 29-29 of Fig. 3.

Referring now to the drawings in detail, the electro-magnetic motivedevice I embodying the present invention is shown operatively connectedto an elevator door DI of an elevator car for opening and closing thelatter, but it will be understood that said motive device can beutilized for other purposes. Part of the frame of the elevator car isindicated at F and said door DI and the other door D2 of the elevatorcar, said doors being coupled together for movement in the usual waylongitudinally of the fixed tracks J, are suspended at their upper endsby means of wheel bracket GI and G2. In Fig. 1 is also shown a corridordoor D3 suspended from and movable longitudinally of the track K xed tothe corridor wall. The corridor door D3 is shown displaced from itsnormal position in relation to the elevator car door DI for the sake ofclearness of illustration, and it will be understood that doors DI andD3 are normally in side by side relation to permit them to be coupledand uncoupled in a suitable Way, for example, in the manner illustratedin my above men- 'tioned application. Parts of an electrically operateddevice for coupling and uncoupling doors DI and D3 are indicated at Oand M in Fig. 1, and require no further description as they do not formpart of the present invention.

Theelevator car door DI is opened and closed directly by anelectro-magnetic device I0 of the present invention. Said devicecomprises three solenoids SI, S2 and S3, all of the same construction,and each having a winding or coil Il and a laminated iron core I2, beingas here shown designed for alternating current operation. Said solenoidsare secured in a frame I3 comprising opposed channel irons I4 as shownin Figs. 2 and 4, one of said channel irons being omitted from Fig. 2 inorder to disclose the solenoids. The cores I2 have brackets I8 securedthereto by which they are fixed to the channel irons I4. The frame I3which comprises the channel irons I4 also include opposed channel ironsI8 secured to the upper flanges of the adjacent channel irons I4 in anysuitable way as by bolts 28. A cover plate 22 is provided for the top ofthe housing and removable end closure members 24 and 26 are provided atthev opposite ends of frame I3, said end closure members having anopening 25 for the passage of the solenoid plunger 28. Channel irons I8constitute a housing for the relays A, B, C and D which will besubsequently described. y

The solenoid plunger 28 is mounted in xed position at the top of theelevator car, as illustrated more or less diagrammatically in Fig. 1,and extends through the three solenoids, as shown in Fig. 2, the latterbeing movable longitudinally of said plunger. In order to permit plunger28 thus to extend through the solenoids, the cores I2 of the latter aresplit as illustrated in Fig. 2, and shown in myprior application,

forming divided core portions 30 between which plunger 28 projects. Itwill be understood that the three solenoids are mounted in alignment sothat said solenoids can move longitudinally of the plunger. Housing I3is supported for movement longitudinally of plunger I4 by upper andlower pairs of rollers 32 and 34, respectively, carried by bearingframes 38 and 38 xed at the opposite ends of channel irons I4 in anysuitable way. Plunger 28 is thus prevented from sagging and a properslight clearance between the solenoid windings and the plunger is thusprovided.

Plunger 28 comprises magnetic sections 40 and non-magnetic sections 42(Fig. 9) arranged alternately adjacent each other in abutting end to endrelation and secured in said relation by a pair of longitudinallyextending channel members 44 of brass or other non-magnetic material.Magnetic sections 40 are laminated being composed of sheet iron orlaminae, and non-mag netic sections 42 are composed of fibre board, woodor other suitable non-magnetic material. Members 44 are spaced from eachother to prevent or reduce eddy current losses. The end sections 4|] ofthe plunger are securely fastened to members 44 in any suitable way asby bolts 46, the ends of which are flush with the outer surfaces ofmembers 44. Plunger 28 is thus constituted by a solid square rodcomposed of magnetic and non-magnetic sections in a split brass or othernon-magnetic casing. The magnetic and non-magnetic sections 40 and 42 ofthe plunger are of the same length and each mag.- netic and non-magneticsection is equal to the axial length of the solenoid winding. The threesolenoids are of the same length and they are in spaced relation in thedirection of the longitudinal extent of plunger 28, the spacing beingequal to one-third of the axial length of a solenoid winding. It will beunderstood that the length of the solenoid winding will depend on thespace available and the power required. When direct current'is used,magnetic sections 40 need not be laminated and the casing of the plungerneed not be split and it will be understood also that with directcurrent plunger 28 can have a circular cross section and the solenoidcoils can be cylindrical.

With the above described arrangement of the plunger and the threesolenoids, it will be found that when one of the magnetic sections ofthe plunger is just entering one of the solenoid windings in eitherdirection, another magnetic section will be almost completely entered inthe winding of a second solenoid, while another magnetic section will beleaving the winding of a third solenoid. Accordingly, by energizing thesolenoid windings in such a manner that only the winding in which themagnetic section of the plunger is beginning to enter is energized andautomatically de-energized when said magnetic section is fully entered,and at the same time relaying the power to the next solenoid winding, acontinuous thrusting movement of the frame I3 to which said solenoidsare secured will result. This movement is transmitted to the elevatorcar DI or to some other device, as the case may be, by connecting thesolenoid carrying frame I3 to the elevator door. By way of illustration,this is accomplished, as here shown, by means of a bracket 48 secured tothe bottom flanges of channel irons I4 and to brackets GI of door DI.

The means for controlling the energizing and,

deenergizing of the solenoid sequence whereby to obtain the abovementioned smooth and continuous thrusting movement will now bedescribed. Said means comprises the current varying means, which in oneform of the invention includes the reactance structure 50 mounted instationary position between channel irons I4 in frame I3. Said reactancestructure comprises three identical reactance or choke coils Rl, R2 andR3 positioned in longitudinally spaced relation Within a laminated ironshell formed of the parts 52 and 54 (Figs. 2, and 6) Said reactancecoils are mounted on and xed to a hollow non-magnetic tube 56 throughwhich plunger 28 is movable with a slight clearance. The manner ofassembling said reactance coils and hollow tube 56 with shell parts 52and 54 will be apparent from Figs. 5 and 6, and it will be understoodthat said coils and said tube 56 are secured in position between parts52 and 54 which are fastened together in any suitable way as by aplurality of bolts (not shown) passing through the openings 58 in part52 and aligned openings 60 in the companion part 54 of said laminatedshell. It will be understood that the opening in hollow tube 56 is inlongitudinal alignment with the central openings of the solenoids sothat solenoid plunger 28 is movable longitudinally axially of thesolenoid windings and of said reactance or choke coils. The firstreactance coil RI is positioned one and one-third the length of asolenoid winding from the adjacent end of the adjacent solenoid winding,in this case solenoid winding S3, and reactance coils RI, R2 and R3 arespaced from each other longitudinally of plunger 28 by a distance equalto the length of the solenoid winding. The axial length of eachreactance coil is equal to one-third the axial length of a solenoidwinding. The reactance or choke coils RI, R2 and R3 are connected in acircuit with electro-magnetically operated means or control relays A, Band C, said circuit also including a reversing relay D (Figs. 2, 3 and17), said control relays being operable under the control of saidreactance coils for energizing and de-energizing the windings ofsolenoids Sl, S2 and S3, in the proper sequence, as will be hereinaftermore specically described in a more detailed explanation of theoperation of this in- Vention.

The control relays A, B and C are identical in construction and each ofthem is provided with two pairs of companion contacts, one pair ofcontacts being normally open and capable of carrying the currentrequired by one solenoid, and the other pair of contacts being normallyclosed and used in the control circuit. These control relays are quickacting relays and are provided with means for adjusting armatureclearance, contact gap, and spring tension. Since, as stated, theserelays A, B and C are of the same construction, a description of one, inthis case relay A, shown in Fig. 4 as well as in Figs. 2 and 3, will besuicient, but it will be understood that any relay having thecharacteristics referred to may be utilized in lieu of the specificrelays herein shown or described. The control relay comprises a coil 62wound for alternating current and provided with an iron core 64 and withan armature 66 pivotally connected as indicated at 68 to core 64.Armature 66 is fixed to the bottom of an insulation member 'l0 whichcarries the movable normally open and normally closed contact members Aland A2 of the control relay, these members being designated as Al andA2, respectively, but it will 56am 00m be understood that they are thesame as the corresponding normally open and normally closed movablecontacts BI and B2, respectively, of relay B and the normally open andnormally closed movable contacts Cl and C2, respectively, of relay C.Companion normally open and normally closed stationary contacts areshown at al and a2, respectively, for relay A; at bl and b2,respectively, for relay B; and at cl and c2, respectively, for relay C.The movable contacts Al and A2 and the corresponding movable contacts ofrelays B and C, are not only carried by pivoted member 'l0 but are alsomovable with respect thereto to permit adjustment of the armatureclearance and regulation of spring tension of said movable contacts whenengaging their companion stationary contacts, respectively. For thispurpose said movable contacts are each connected to a pin 12, the lowerend of which passes loosely through the companion movable contact memberand is secured to contact carrying member 10. Collar 14, slidablelongitudinally of pin 'I2 near the lower end thereof, bears on the upperpart of the companion movable contact member and is held resilientlyagainst the latter by a compression spring 16. The upper end of springI6 bears against a slidable collar 18 which can be adjustedlongitudinally of pin 12 by a nut 86 threaded on the upper end of pin12. The movable contact members are held against turning axially of pinl2 by screws 82 which pass through slots at the inner ends of saidmovable contact members, respectively, so that said movable contactmembers can move in relation to carrying member 10, as well as with thelatter, for engaging the companion stationary contact mem* bersresiliently under the pressure of the companion springs 12, withoutlimitation by the movement of armature 66 to its retracted position. Aspring 84 holds the armature in its upper or retracted position, saidspring being connected to contact carrying member 10. The clearance ofarmature 66 is adjusted by a screw 86 which is threaded through the topof the U-shaped strap 88 secured to the mounting insulation panel P. Itwill be understood that when the coil of the relay is de-energizedspring 84 moves the armature 66 to its retracted position against thelower end of screw 86 and that by adjusting said screw in strap 88 theclearance of the armature is adjusted. The stationary contact members aland a2 are as here shown constituted by screws which are adjustable ininsulation supports 90 and 92. The terminals for the movable contactmembers may be connected to the screws 82 while the terminals for thecompanion stationary contact members can be connected to the metalstrips 94 which are secured to thecompanion insulation supports by nuts96 in which the screws of the companion stationary contact members aland a2 are engaged.

The reversing relay D is a triple-pole doublethrow, alternating currentrelay wound to operate by the line current. This relay has three pairsof normally open companion contact members and three pairs of normallyclosed companion contact members, the normally open movable contactmembers being indicated at DI, D3 and D5 and the normally openstationary contact members being indicated at dl, d3 and d5. 'Ihenormally closed movable contact members are indicated at D2, D4 and D6and the normally closed companion stationary contact members areindicated at d2, d4 and d6. This reversing relay is constructedsubstantially in the same way as the control relays A, B or C and has asingle coil 98 and a single armature I 00 which operates all of themovable contact members of this relay, said amature being pivotallymounted in the same way as the armature 66 of the control relay andbeing fixed to a carrying plate |02 which is spring retracted in thesame way as carrying plate 10. The carrying plate |02 of this relaymounts the movable contact members in the same way as in the controlrelays, and said movable contact members are spring -pressed in the sameway as the movable contact members of the control relays for resilientengagement with the companion stationary contact members. Saidstationary contact members are of the same construction as thestationary contact members of the control relays and are mounted insubstantially the same way, the normally open stationary contact membersbeing adjustable in an insulation support |04 and the normally closedstationary contact members being mounted in an insulation support |06.The terminals for the movable contact members are connected thereto inthe same way as in the control relays and the terminals for thestationary contact members are connected to the strips |08 which are thesame as the contact strips 94 of the control relays. The clearance ofarmature of the reversing relay is adjusted by a screw H0 which is inthreaded engagement with the top of the strap H2 and engages contactcarrying member |02 in the same way as the engagement of adjusting screw86 with contact carrying member l0 of the control relays.

The operation of the above described apparatus will now be describedwith more particular reference to Figs. 11 to 17. Referring first toFig. 17, it will be noted that each of the control relay windings 62 isconnected in series with one of the reactance coils RI, R2, R3, so thatthe current flowing through the relay winding is governed by theimpedance of the reactance or choke coil with which it is connected. Thewindings of the control relays and reactance coils are so matched thatwhen a magnetic section 40 of plunger 28 is entered in the reactancecoil, the inductive reactance due to the presence of said magneticsection in the reactance coil in addition to the inductive reactance dueto the iron shell of the reactance coil is so high that the resultantcurrent o'wing through the relay is lower than the pick-up rating of therelay and the latter remains open at its normally open companioncontacts Al, al in the case of relay A or at the corresponding normallyopen contacts BI, bl in the case of relay B or the normally opencontacts Cl, cl in the case of relay C. However, when the iron segment40 is withdrawn from the reactance coil, the inductive reactance islowered sufficiently to allow an increase in current which is suflicientto close the companion relay at its normally open companion contacts andto simultaneously open the normally closed companion contacts of saidrelay.`

Referring now to Figs. 11 to 16, and assuming for the purpose ofexplanation that the solenoid windings and the reactance coils arestationary and that the solenoid plunger 28 is movable, Fig.

l1 shows the position of plunger 28 after solenoid S2 has drawn magneticsection 40(e) completely into its Winding. In this position, it will benoted, magnetic section 40(f) is partially entered in solenoid S3 at theright thereof while magnetic section 40(9) is partially entered intosolevmove to the left.

noid l at the left thereof. It is obvious that if solenoid Sl is nextenergized, the plunger will move to the right while on the other hand,if solenoid S3 is then energized the plunger will We lwill now assumethat plunger 28 is to move to the left as indicated by the arrow in Fig.11.

Referring still to Fig. 11, it will be observed that magnetic section(11) of the plunger has left the winding of reactance coil R2, thuslowering the reactance of its circuit and closing relay B throughnormally closed contacts C2, c2 of relay C (Fig. 17) and contacts D6, d6of relay D. When relay B closes, its normally closed contacts B2, b2open circuit relay A and its normally open contacts BVI, bl close,thereby completing a circuit through solenoid S3 across the lineterminals Tl, T3 supplied with alternating current through the mainswitch MS from the lines Ll and L2. When solenoid S3 is thus energizedit draws magnetic section 40(1) of the plunger into its winding and theplunger moves to the left, bringing the plunger to the position shown inFig. 12. At this instant when plunger section 40(1) is completelyentered in solenoid S3, the magnetic section 40(1) of the solenoidplunger is fully withdrawn from the reactance co1l R3 lowering itsreactance to minimum, so that the flow of current increases through saidcoil R3 passing through the latter and normally closed contacts A2, a2of relay A and contacts D2, d2 of relay D, thus energizing the coil ofrelay C. When the coil of relay C is energized, its normally closedcontacts C2, c2 open, thus disconnecting the coil of relay B. When relayB is disconnected its contacts B2, b2 close and a current of low valuewill flow through the reactance coil Rl and relay A in preparation forits closing operation, but at this time section 4001,) of the plunger isfully entered in reactance coil Rl causing maximum inductance whichmaintains the current at such a low value that said current isinsufficient to energize relay A. On the other hand, the contacts BI, blof relay B open and disconnect solenoid S3 thus releasing the magneticsection 40(1) of the plunger. When relay C closes, its normally opencontacts Cl, cl close thus connecting the winding of solenoid Sl acrossthe line so that said solenoid Si is energized and draws magneticsection 40(e) into said solenoid winding so that the movement of plunger28 continues to the left as shown by the arrow in Fig. l2 bringing theplunger to the position shown in Fig. 13. Magnetic section 40(h) of theplunger has now left reactance coil RI causing current to flow throughcontacts B2, b2 of relay B to the contacts D4, d4 of relay D and thusenergizing the winding of relay A. When relay A is thus energized relayC is de-energized and the winding of solenoid SI is likewisecle-energized, thus releasing magnetic section 40(6) of the plunger andat thisI time the winding of solenoid S2 is energized thereby drawing inmagnetic section 40(1) of the plunger bringing the plunger to the sameposition in relation to the solenoid and reactance windings as thatillustrated in Fig. 11. The cycle thus far described then repeatsitself, the plunger moving continuously to the left for the length oftravel allowed by the length of the solenoid.

If movement of plunger 28 to the right is desired, the relay D is closedby closing the switch RS, switch RA (hereinafter more specificallyreferred to) being open. When switch RS is closed and switch RA is open,contacts D2, D4"

and D6 of relay D open, disengaging their cornpanion contacts d2, d4 andd6 and contacts DI, D3 and D5 close engaging their companion contactsdI, d3, and d5, respectively. When this occurs the action, starting withthe position of the parts illustrated in Fig. 14, takes place in thesame Way described above with reference to Figs. 11 to 13 but in theopposite direction, that is to the right as shown by the arrows in Figs.14, 15 Aand 16. More particularly, the position of the plunger in Fig.14 is the same as in Fig. 1. Magnetic section (h) is clear of reactancecoils RI and R2. In this case, the inductance of these reactance coilsis minimum allowing maximum current to ow in either direction, but byreference to Fig. 1'7 it will be noted that when current ows throughreactance .coils RI, contacts B2, b2, D3, and d3, relay C is energized.When relay C is energized, its normally closed contacts C2, c2 open andprevent current from flowing through reactance coil R2, while itsnormally open contacts CI, cI being closed, complete a circuit throughsolenoid SI so that the latter draws section `4Il(g) of the plungerwithin its winding thereby causing the movement of the plunger to theright to the position illustrated in `Fig. 15. It will be understoodthat said plunger continues to move to the right to the positionsillustrated in Figs. 15 and 16 in the same manner as explained abovewith reference to Figs. 12 and 13, resulting in the movement of theplunger to the position illustrated in Fig. 14, which is the samerelative position as that shown in Fig. 11, thus completing the cyclewhich is repeated, plunger 28 continuing to move to the right to theextent allowed by the ylength of the plunger until switch RS is opened.Accordingly, it will be understood that by opening and closing switch RSat the proper times, the plunger will reciprocate, moving alternately tothe left, as illustrated in Figs. 11 to 13, and to the right asillustrated in Figs. 14 to 16.

The present invention makes provision for the automatic opening andclosing of the reversing relay D. For this purpose, a relay E isconnected in the circuit, as shown in Fig. 17, through the manuallycontrolled switch RA, said relay being associated with a branch circuithaving the normally open contacts EI, el and the normally closedcontacts E2, e2, contacts E| and E2 being movable and contacts eI and e2being stationary. The armature H4 of relay E controls companion relaycontacts E3, e3, said last mentioned contacts being normally held openby a spring H6, contact E3 being a movable contact and contact e3 beinga stationary contact. Contacts El and E2 are biased to open and closedpositions, respectively, in any suitable way and are closed and opened,respectively, by operation of levers H8 and |20, respectively. It willbe understood that levers H8 and |20 although shown at a short distancefrom each other will in actual practice be spaced at a distanceapproximately equal to the travel of plunger 28 (or of the solenoids SI,S2 and S3) in one direction so that said levers will be engaged at theend of the travel of the plunger (or of the solenoids) in eitherdirection, thus alternately closing contacts EI, el, and openingcontacts E2, e2. It will be understood that when the automatic operationof the reversing relay D is desired under the control of relay E and itscompanion branch circuit, switch RS is opened and switch RA is closed.In the position of the parts illustrated in Fig. 17, relay D isole-energized as the contacts E3, e3 of relay E are open, said relay Ebeing de- Search Room energized. It will be observed that one side ofwinding 98 of relay D is connected by the wire H9 leading to the mainline I2I connected to terminal Tl and that the other side of the relaywinding 98 is connected by a wire |22 to a termi- `nal T2 which connectswith the other side |24 of the line, leading from the terminal T3 eitherthrough the line |26 controlled by the switch RS or through the branchline |28 controlled by the relay contacts E3, e3, or through thecontacts EI, eI and E2, e2. Branch line |28 connects line |24, throughswitch RA, to movable contact member E3 of relay E.

When the reversing relay D is to be energized automatically followingthe limit of travel of plunger 28 to the left, so that said travel willbe reversed and take place in the right hand direction, as describedabove, automatically under the control of relay E and the associatebranch circuit, switch RS is opened and switch RA is closed. It will beunderstood'of course that the movement of the solenoid windings, and thecasing I3 carrying the same, to the right is the equivalent of themovement of the solenoid plunger to the left. Accordingly, when casingI3 reaches the limit of its travel to the right, relay D is closed, thatis, a circuit is completed through its Winding 98, so that the movementof casing I3 will be reversed and take place to the left. For thispurpose, the normally open contacts EI, el are arranged to be closedwhen casing I3, or a part connected thereto and movable thereby, reachesthe limit of its travel to the right. This will occur when said casingengages lever H8 whereby to actuate movable contact EI for engaging itscompanion stationary contact el. When contacts EI, eI are thus engaged,current passes from main line |24 through switch RA through contacts EI,eI to wire |30 (which connects movable contact El to stationary contacte2) and then through the normally closed contacts e2, E2 and from thelatter over the Wire |32 to one side of the coil |34 of relay E,fpassing through said coil I 34 and to the other main line I 20 over thewire I 36. Winding |34 is thus energized and operated to close thenorrmally open contacts E3, e3 and current flows from line |24 over wire|28, through said contacts E3, e3 over wire |22 to one side of winding98 of relay D and then over wire H8 to the other main line |20, thusoperating the reversing relay D. At this time, current may also flow tothe winding of relay D from the contacts EI, el over the wire |30 andover the wire |38 to wire I 22, so that the winding 98 of relay D isenergized instantaneously upon the closing of contacts EI, el. However,a holding circuit through relay E is provided for maintaining thewinding 98 of relay D energized until casing I3 or the part operatedthereby reaches the limit of its movement to the left, at which timelever |20 is operated by the casing or by some other part movablethereby, whereby to disengage movable contact member E2 from itscompanion stationary contact member e2, thus breaking the circuitthrough winding |34 of relay E. When the winding of relay E is thusde-energized, spring H6 of relay E disengages movable contact vE3 fromthe companion stationary contact e3, thus breaking the circuit throughthe winding 98 of the reversing relay D and restoring said reversingrelay to its condition for the movement of the solenoid plunger to theleft or the equivalent movement of the solenoid windings or casing I3 tothe right. It

will be noted that the holding or locking cirl cuit for relay Ylil'maintains the winding |34 of said relay energized from the time thatswitch contact lever H8 is disengaged to the time that switch lever |20is engaged, current for energizing winding |34 being then supplied'fromline |24 over wire |28 through contacts E3, e3, wire |38 throughnormally closed contacts E2, e2 and wire |32, this holding circuit beingbroken when switch lever |20 is operated to disengage contact E2 fromcontact e2, thus resulting in deenergizing Winding 34 and the opening ofthe circuit at contacts E3, e3, this circuit remaining open untilc'l'intacts'y El, e2 are closed when casing |3 again reaches the limitof its travel to the right.

Instead of utilizing the circuit illustrated in Fig. 17, the circuitshown in Fig. 18 may be used and in that case the control relays A', Band C' instead of having one Ipair of normally open contacts and onepair of normally closed contacts as in the case of relays A, B and pwill each have two pairs' of companion normally open contacts. Theoperation of the apparatus with these relays inthe circuit asillustrated in Fig. 18 will now be described, reference being had alsoto Figs. l1 to 16 in conjunction with I Fig. 18. Assuming that theplunger is in the position illustrated in Fig. 11 and is to move to theleft, as soon as the magnetic' section 40(11) leaves reactance coil R2an increasein the flow of current through relay B' takes' place, thusclosing said relay at both of its normally open contacts, the flow ofcurrenttaking place from line l|24 to one side of reactance coil R2 andfrom the other side thereof to the normally closed the rmain lines |20and |24 and short circuits relay A', the latter being in series withreactance coil RI when contacts B'2, b'2 of relay B are open. Relay A'being thus short circuited is thus deenergi'zed and opens at both fpairsof its companion contacts A'l, a'l, and A'2, a'2, thus breaking thecircuit through solenoid S2. This brings the plunger to the 'positionillustrated in Fig. 12, at which time solenoid SI is energized by theclosing of relay C at its companion contacts C|, c'| which occurs whenrelay A' was de-energized and opened at its contacts A'2 and a'2. Itwill be understood that in moving from the position illustrated in Fig.11 to the position illustrated in Fig. 12, section 40(2) of the plungeris moved out of reactance coil R3, thus causing current to ow from line|24 through said reactance coil andfrom the latter to the contacts D2,d2 of relay D toone side of the winding 62 of relay C and from the otherside vof said winding to the other main line |20, thus closing saidrelay at its contacts C|, c'| and completing a circuit from one mainline |2| through said contacts C|, c'| to one side of the winding ofsolenoid SI and from the other side of said winding tothe other vmainline |24.

At the same time, the contacts C2, c2 are closed and thereby throwOreactance fcoil R2 directly across the main lines |2| and |24, shortcircuiting yrelay B', thus de-energizing the winding 62 of the latter sothat it opens at' both pairs of its companion contacts. When relay B' isopened the winding of solenoid S3 is de-energized and the parts are inthe position illustrated in Fig. 13 following which solenoid S2 is to beenergized. At this time section 40(h) of the plunger has left reactancecoil RI so that a flow of current takes place from line |24 through saidreactance coil and from the latter to contacts D4, d4 of relay D to oneside of winding 62 of relay A' and from the other side of said windingto line |2|, thus energizing said relay and closing both |pairs of thecompanion contacts of the latter. The closing of the contacts A' a'l ofrelay A' completes a circuit through the Winding of solenoid S2 from oneline |2| through said contacts A'i, a'l to one side of said solenoid andfrom the other side of said solenoid to the other main line |24. At thesame time, contacts A2, a'2 of relay A close and short circuit thewinding 62 of relay C', thus de-energizing said relay so that both ofthe pairs of contacts thereof open. This completes the cycle which isrepeated along successive lengths of the plunger. When it is desired tomove plunger y28A to the right, relay D is operated either by theAclosing of switch RS, switch RA being open for manual operation, or byopening switch RS and closing switch RA, for automatic reversingoperation as described above with reference to Fig. 17, relay E and thebranch circuit associated therewith being the same as in Fig, 17. Whenwindingv 08 of relay D is energized for operating said relay, thenormally closed conf' tacts D2, d2, D4, d4, and DB, d6 are opened andthe normally open companion pairs of contacts DI, dl, D3, d3 and D5, d5are closed. When said normally open contacts of relay DV close, ,plunger28 moves to the right, the solenoid windings are energized under thecontrol of relays A', B' and C' in the same way as just described inexplaining the movement of the solenoid plunger to the left except thatthe solenoid windings are energized in the order of solenoid windingsSl, S3, and S2. It will be noted that the relays A', B' and C' areoperated in the circuit under the control of reactance coils RI, R2 andR3 so that when one relay is energized the relay which was justpreviously energized is short circuited and is de-energized and therebyprepares the third relay to be energized as soon as the magnetic sectionmoves out `of the reactance coil which controls the operation of saidthird relay.

It will be understood that relays A', B' and C' may be of the sameconstruction as relays A, B and C with the exception that both sets ofcontacts, being normally open, are at the same side of the pivot 68,namely at the sideA at which the contacts AI, al of relay A arepositioned as illustrated in Fig. 4. Thisy is illustrated in Figs. 19and 20.

In accordance with the form of the invention illustrated in Figs. 21 to27, transformers are utilized instead of the reactance coils, inconjunction with the plunger 28, as the current varying means forcontrolling the operation of the ycontrol relays A, B and C, thearrangement being such that the magnetic sections 40 of the solenoidplunger 28, by moving into and out of the transformer windings,vary thecurrent induced in the transformer secondaries and thereby control theoperation of the control relays A, B and C for controlling theenergization and de-energization, in the rproper sequence, of thewindings of the solenoids SI, S2 and S3. In this form of the invention,the solenoid windings and the plunger 28 are of the same construction asdescribed above and the solenoid windings have the same spaced relationlongitudinally of the plunger as in the above described forms of theinvention, and also in this form of the invention the axial length ofthe transformer winding is one-third the length of a solenoid winding,but in this form of the invention the transformers TRI, TR2 and TRS arespaced apart longitudinally of the solenoid plunger 28 a distance equalto one-third of the length of a solenoid winding and transformer TRI,which is closest to the adjacent solenoid winding S3, is spaced fromsaid solenoid S3 a distance equal to one and two-thirds the axial lengthof a solenoid winding. The transformers are preferably mounted in alaminated iron shell and on a non-magnetic tube like the tube 56 shownin Figs. 5 and 6, and the primary and secondary windings of saidtransformers are connected in the circuit as illustrated in Fig. 27, theprimary windings PW of said transformers being connected directly acrossthe main lines and |24 and the secondary windings SW of saidtransformers being connected to the control relays as shown in saidwiring diagram (Fig. 27).

The reversing relay D' which corresponds to the reversing relay D in theabove described forms of the invention (Figs- 17 and 18) issubstantially the same as said reversing relay D with the exception thatrelay D' is as illustrated in Fig. 27 a six-pole double-throw relaywhile relay D is a three-pole double-throw relay. It will be noted alsothat the reversing relay D can be operated either by closing switch RSfor manual operation, switch RA being open, or by closing said lastmentioned switch for automatic operation, switch RS being open, asexplained above in connection with Figs. 17 and 18. The normally closedcompanion contacts of reversing relay D are indicated in Fig. 27 at DI,d; D3, d3; D5, d5; D'I, d1; D9, dS; and DH, dII; while the normally opencompanion contacts of said relay are indicated at D2, d2; D4, d4; D6,d6; D8, d8; DI8, dill; and DI2, dI2. Also it will be understood that allo-f the movable contacts are connected for operation in unison by theinsulation rod DI which is connected to the armature |00' of thisreversing relay.

The operation of the apparatus in accordance with this form of theinvention as illustrated in Figs. 2l to 27 will now be described. First,it will be understood that, as in the circuit in which the reactancecoils are used as part of the ourrent Varying means, the current in thetransformer secondary is insufficient to operate the control relay whenthe nonmagnetic section of plunger 28 is entered in the transformerwinding but increases to a value sucient to operate the control relaywhen the magnetic section or iron core of the plunger is entered in saidwinding. Referring to Fig. 27 in conjunction with Figs. 21 to 26 and rstwith reference to Fig. 21, assuming that the solenoid plunger is to moveto the left, as indicated by the arrow, when magnetic section 40(6)enters transformer TRI, the secondary current is increased and closesrelay A through the normally closed contacts C2, c2 of relay C andthrough the normally closed contacts DI, dI, and DII, dII of relay D'.When relay A closes, the normally closed contacts A2, a2 of said relayopen, dropping out relay B, and the normally open contacts AI, aI ofrelay A bllilll UUm being closed, solenoid S3 is energized and pullsplunger 28 to the left bringing it to the position shown in Fig, 22. Atthis point magnetic section 40(g) of the plunger enters transformer T3causing an increase in the secondary current of said transformer andthereby closes relay C through the normally closed contacts B2, b2 ofrelay B and through contacts D1, d'I and contacts D9, (Z9 of relay D'.Upon the closing of relay C, the normally closed contacts C2, c2 of saidrelay open, thereby disconnecting relay A, which in turn de-energizessolenoid S3, and the normally open contacts CI, cI of relay C close,thus energizing solenoid SI, which draws in magnetic section 480i),moving plunger 28 to the left to the position shown in Fig. 23. At thisposition of the plunger, magnetic section 40(g) enters transformer TR2causing an increase in current in the secondary of said transformerwhich causes relay B to close. When relay B closes, its normally closedcontacts B2,

b2 open, thereby disconnecting relay C and deenergizing solenoid SI andclosing the normally open contacts BI, bl, thus energizing solenoid S2.When solenoid S2 is energized, it draws in the magnetic section 40(1) ofthe plunger, which is then in the saune relative position in respect tothe solenoids as in Fig. l. This completes the cycle which is repeatedsuccessively along the length of the rplunger. It will be understoodthat the movement of the plunger to the right takes place upon theclosing of either switch 'RS for manual operation, or switch RA forautomatic operation, as described above with reference to Fig. 11 or toFig. 18.

As illustrated in Figs. 2, 3 and 4, the controlling relays and thereversing relay are mounted on the insulation panel P within the casingI3, but it will be understood that said relays need not be mounted formovement with casing I 3, but can be disposed on a pane] remote fromcasing I3, for example, in a switch room and connected in the circuitWith the solenoids and with the reactance coils by a movable cable.However, since the need for this movable cable is eliminated by mountingthe relays for movement with casing I3, the presently preferredembodiment of said relays provides for mounting them in casing I3.

When, as here shown, the relays are mounted in casing I3, it isadvantageous to provide for the mounting and removal of said relays as aunit in readily removable relation to the solenoid and reactance coilsin said casing so that in the event of the necessity for repairs oradjustments which cannot be easily made or which require considerabletime, the unit, comprising mounting panel P and the relays carriedthereby, can be easily removed from the casing and if desired,immediately replaced by another similar unit. In this respect theconstruction and arrangement contemplated in accordance with the presentinvention makes provision for the quick mechanical securement of theunit in casing 30 and the quick electrical connection of the relays tothe solenoid and reactance coil windings. First, it will be understoodthat the relays A, B, C and D are mechanically secured to mounting panelP in any suitable way, unnecessary to be described or illustrated. Inorder, however, to removably secure panel P in housing I3 and moreparticularly between channel irons I8, said insulation panel P hassecuredthereto, as illustrated in Figs. 2, 3, 28 and 29, a pluralityofmetal plates or bars |40, I4I, |42 and |43 disposed in transverselyspaced relation in the space between relays C and D, and similar plates|44, |45 and |46 are secured to said panel P at points spacedlongitudinally thereof near relays A, B and C, respectively. Said plates|40 to |46, inclusive, are of the same construction and each of saidplates is secured to panel P by a bolt |48 which passes through saidpanel and is secured at the under surface of the latter by a nut |50,and to the lower end of said bolt an electric terminal member |52 issecured by a nut |54. Each of said plates |40 to |46 is also providedwith a circular opening |56 for the slidable projection therethrough ofa conducting stud here shown as a bolt |58. In the case of plates |40 to|43, inclusive, the companion bolts |58 are carried by an insulationplate |60 (Figs. 2, 28 and 29) which is secured to and below the upperilanges of channels I4 by screws or bolts |62. By reference to Fig. 28it will be observed that spacing members |64 are disposed between theupper surface of plate 60 and the lower surfaces of the upper flanges ofchannel irons I4, so that plate |60 will be disposed in spaced relationto the lower surface of insulation panel P to provide a space for thewires leading to the terminals. Each bolt |58 is secured to plate |60 bya nut |66, and said bolt is secured to the companion metal plate at theupper surface of insulation panel P by a nut |68. An electric terminalis secured to bolt |58 in any suitable way, as for example by the nut|66. It will be understood that when nut |68 is threaded down on bolt|58 for engagement with the companion metal plate at the top ofinsulation panel P, the

latter is mechanically secured removably in the housing and at the sametime said metal plate is electrically connected to the companion bolt|58 and to the terminal |10 carried by the latter. Each of plates |44 to|46 is similarly connected to panel P by a screw |48 the lower end ofwhich carries a terminal |52 and said metal plates |40, |45, and |46 aremechanically and electrically connected to companion insulation plates|60A, |60B and |60C, respectively, each of which is secured at itsopposite ends to the upper nanges of channels |4 in spaced relation inthe same way as illustrated in Fig. 28 with reference to plate |60 toprovide a space for the wiring connected to the terminals at the lowerends of bolts |48. It will be understood that by removing the nuts |68from the bolts carried by plates |60, |60A, |60B and |600, said panelcan be easily removed through the top of housing 3 (top plate 22 havingbeen removed) together with all of the wiring connected to the terminals|52 at the lower ends of bolts |48. It will be observed by reference toFig. 3 that panel P also carries terminals TI, T2, and T3, referred toabove with reference to the circuit diagram illustrated in Fig. 17. Itwill be understood that all of the terminals except the terminalsconnected to bolts 58 are carried by the insulation panel P, and fromthe wiring diagram illustrated in Fig. 17 the connections 0f saidterminals in the circuit will -be readily understood by those skilled inthe art. Although relay E is not shown mounted on panel P, it will beunderstood that said relay may also be mounted on said panel, ifdesired, and when said relay is not mounted on said panel it is to beconnected, when used, in. the circuit by an appropriate cable.

It will be understood that the invention may be embodied otherwise thanas herein disclosed and that in the illustrated embodiments certainchanges in the details of construction and in the arrangement of partsmay be made without departing from the underlying idea of the presentinvention. Also, it will be understood that while I` have illustratedthe invention as used for operating an elevator door, the invention maybe used for operating other devices and, more generally, the principleof the present invention may be applied to other purposes. Accordingly,I do not wish to be limited t0 the invention as herein specificallyshown or described except to the extent which may be required by thescope of the appended claims.

Having thus described my invention, what I claim and desire to secure byLetters Patent is;

1. Apparatus of the character described comprising a motive deviceincluding a plurality of solenoid coils arranged in tandem, a solenoidplunger having alternate magnetic and nonmagnetic sections arranged intandem, said coils and plunger being mounted for relative axialmovement, a plurality of reactance coils arranged in tandem andpositioned in axial alignment with said solenoid coils, said reactancecoils and said plunger being mounted for relative axial movement, saidcoils and said sections of the plunger being relatively positioned sothat one of said magnetic sections is at least partly in one of saidreactance coils when another of said magnetic sections is at least`partly in one of said solenoid coils, and means operable under thecontrol of said reactance coils during the movement of said plunger toconnect one of said solenoid coils to a source of electric current andto disconnect another of said solenoid coils from said current source.

2. Apparatus of the character described comprising a motive deviceincluding a plurality of solenoid coils arranged in tandem, a solenoidplunger having alternate magnetic and nonmagnetic sections arranged intandem, said coils and plunger being mounted for relative axialmovement, a plurality of reactance coils arranged in tandem andpositioned in axial alignment with said solenoid coils, said reactancecoils and said plunger being mounted for relative axial movement, saidcoils and said sections of the plunger being relatively positioned sothat one of said magnetic sections is at least partly in one of saidreactance coils when another of said magnetic sections is at leastpartly in one of said solenoid coils, and means operable under thecontrol of said reactance coils during the movement of said plunger toconnect one of said solenoid coils to a source of electric current andto disconnect another of said solenoid coils from said current source,and means for reversing the direction of relative movement between saidplunger and said solenoid and reactance coils.

3. Apparatus of the character described com- Iprising a motive deviceincluding a plurality of solenoid coils arranged in tandem, a solenoidplunger having alternate magnetic and non-magnetic sections arranged intandem, said coils and plunger being mounted for relative axialmovement, a plurality of reactance coils arranged in tandem andpositioned in axial alignment with said solenoid coils, said reactancecoils and said plunger being mounted for relative axial movevment, saidcoils and said sections of the plunger being relatively positioned sothat one of said magnetic sections is at least partly in one of saidreactance coils when another of said magnetic sections is at leastpartly in one of said solenoid coils, and means operable under thecontrol of uv I oym'orglw @UCIMU UUW said reactance coils during themovement of said plunger to connect one of said solenoid coils to asource of electric current and to disconnect another of said solenoidcoils from said current source, and means for predetermining thedirecbetween adjacent solenoid windings being about tion of relativemovement between said plunger one third the length of a solenoidwinding, said and Said solenoid and reactance Coils, solenoid windingsand said plunger being mounted 4. Apparatus of the character describedeomfor relative movement in the longitudinal direcprisirig a motivedevice including a solenoid havlo tion 0f the llllllngeldanq IlatVelymOVable saig ing a coil and a plunger, means operable to condirection Wen Sa1 Wm lngS .are enel'glZe an nect and disconnect said coil to andfrom a source meals for siccessivly eI1rf1Z-1Y1g tsld Selllold ofelectric current, and reactance means oper- Will mgs an 01 @-enelglZlIlge Wm lngS able in response to relative movement of said coil when themaeneue elections 0f the plunger are and plunger for controlling Itlieoperations of said Centered 111 Sald WlrldlngS- connect and disconnectmeans, and means for 9- :E Tltlla'l apparatus COmDIlSlllg a frame, anpredetermining the direction of relative moveeletlleal deVlCe mounted 0nSad fr ame, a Panel, ment between said coil and said plunger. anelectrical devife meanted or; Sad lae' 92nd 5. Apparatus of thecharacter described cornmeans for connec mg Sad pane 'm0u n e eVlCeprising a motive device including a solenoid navte Seid rs mentionedeleviee, eempnsing e Cenlng a coll and a plungery means operable toconducting-stud xed to said frame and a conductnect and disconnect saidcoil to and from a source lng plate fixed '0 0 Sad panel and havmg al?Open' of electric current, and reactance means opermg f or the roletlontherethrough Sad Can able in response to relative movement of saiddactmg'stu f at? means for remova y Sacunag coil and plunger forcontrolling the operations Sad Stud to Sad plate whereby to secure salaof said connect and disconnect means, and means Panel removably on Sadframeautomatically operative in response to a predela Apparaals of taacaaraaaer descnbed-com" termined relative movement of said coil andprisma: a mauve devlaa mcludmg aplurahty of plunger in one direction toreverse the direction solenolgncosa Solenald plfnger lavmg alamae ofsaid relative movement.' magno 1c an non-magne 1c sec ions, sai coi s 6.Electro-magnetic motive means comprising and plunger b eing mounted aar.relativa molle" a solenoid plunger having longitudinally extendman?, aplurahay of control Wmdmgs .means m' ing magnetic and non-magneticsections of equal alumna magnetla parts mavablaby sala plunger lengthdisposed successively along the length of relatlonttghsala controltwndmgsdfor Varymg the plunger in end to end relation, a plurality eCurran arem raspec we y. an .maans op oi' solenoid windings disposed inspaced relation 35 arable andar the caatroaof sala Wmdmgs forlongitudinally of Said plunger Said solenoid connecting one of saidcoils to a source of cur- Wlndlngs and said plunger being mounted forrent and for disconnecting another .of said c oils relative movement inthe longitudinal direction from the Source of Current when sala one C0111s of the plunger and relatively movable in said connected thereto' tdirection when said windings are energized, the 49 Apparatas of aaacharac ar aesanbad-com" axial length of each of said solenoid windingsbeprisma. a naotwa davlca. mcludmg a plprahty of ing equal to the lengthof one of said sections solanola calls. a solenold plungtar havag' altaaof the plunger, the distance between adjacent nata magnatlc andnan-magna 1c Saa lans Sal solenoid windings being about one third theaxial cons and plunger .bemg mmmtaa aar relai-'Iva length oi a solenoidwinding and means for ena5 movement a plurahty of control Wmdlaas meansergizing said solenoid windings one at a time analualag maaneac partsmovabla by sala plunger ln succession in relation to said controlwindings for varying 7. Electro-magnetic motive means comprising thecurrent tharam raspeatwaly. anamaans op' a solenoid plunger havinglongitudinally extendarable andar the Coatroaof sala Wmdmas for `50connecting one of said coils to a source of curing magnetic andnon-magnetic sections of equal tth f -d -l length disposed successivelyalong the length of rent and for disconnec ing ano ero sai cors theplunger in end to end relation a plurality of from the source of currentwhen said one coil is solenoid windings disposed in spaced relationlonconectad thereto and means automatmauy O-pgltudinally of said plungerthe length of each erative in response to a predetermined relative ofSaid windings bein@ equal to the length of one movement of said coilsand plunger in one d1- b o o o of said sections of the plunger and thedistance rmegggftsagl gg gn of relatwe movebetween adjacent solenoidwindings being about a one third the length of a solenoid winding, saidpgOeglaecggdsgllgn slafnold vldmgs and Salaplungar bamg mmm?" solenoidcoils, a solenoid plunger having altere el' re a We movement 1n thelollgltudmal d1' nate magnetic and non-magnetic sections, said rectien0i the plunger and relatlvely movable coils and plunger being mountedfor relative in said direction when said windings are enermovement, aplurality of control windings, means gized, and .means operableiorsuccessively enincluding magnetic parts movable by said plungergizing-said solenoidwindings in one sequence er in relation to said controlwindings for varyfor effecting said relative movement in one direcingthe current therein, respectively, and means tlen and for successivelyenergizing said solenoid operable under the control of said windings forWlndlngs successively in a reversed .sequence for connecting one of saidcoils to a source of cureifecting said relative movement in a reverserent and for disconnecting another of said coils direction. from thesource of current when said one coil 8. Electro-magnetic .motive meanscomprising is connected thereto, and means operable under a solenoidplunger having longitudinally extendthe control of said last mentionedmeans for ening magnetic and non-magnetic sections of equal ergizing oneof said windings and for simultanelength disposed successively along thelength of ously de-enei'gizing another of said windings. the plunger inend to end relation, a plurality 13. Apparatus of the characterdescribed complunger.

prising a motive device including a plurality of solenoid coils, asolenoidplunger having alternate magnetic and non-magnetic sections,said coils and plunger being mounted for relative movement, a pluralityof control windings, means including magnetic parts movable by saidplunger in relation to said control windings for varying the lcurrenttherein, respectively, and means operable under the control of saidwindings for connecting one of said coils to a, source of current andfor disconnecting anotherof said coils from the source of current whensaid one coil is connected thereto, said last mentioned means comprisingaplurality of relays having windings in series with said controlwindings, respectively, for controlling the energization of said controlwindings during said connection and disconnection of said solenoidcoils. i n

14. Apparatus of the character described comprising a motive deviceincluding a plurality of solenoid coils, a solenoid plunger havingalternate magnetic and non-magnetic sections, said coils and plungerbeing mounted for relative movement, a plurality of control windings,means including magnetic parts movable by said plunger in relation tosaid control windings for varying the current therein, respectively, andmeans operable under the control of said windings for connecting one ofsaid coils to a source of current and for disconnecting another of saidcoils from the source of current when said one coil is connectedthereto, said last mentioned means comprising a plurality of relayshaving windings in series with said control windings, respectively, forcontrolling the energization of said control windings during saidconnection and disconnection of said solenoid coils, each of said relayscontrolling the circuit of the winding of another of said relays inseries with one of said control windings and a pair of relativelymovable contacts engageable with and disengageable from each other inresponse to energization of the companion relay winding for effectingsaid connection and disconnection of one of said solenoid coils.

15. Apparatus of the character described comprising a motive deviceincluding a plurality of solenoid coils, a solenoid plunger havingalternate magnetic and non-magnetic sections, said coils and plungerbeing mounted for relative movement, a plurality of control windings,means including magnetic parts movable by said plunger in relation tosaid control windings for varying the current therein, respectively, andmeans operable under the control of said windings for connecting one ofsaid coils to a source of current and for disconnecting another of saidcoils from the source of current when said one coil is connectedthereto, and means operable under the control of said last mentionedmeans for energizing one of said windings and for simultaneouslyde-energizing another of said windings, and means automaticallyoperative in response to a predetermined relative4 movement of saidcoils and plunger in one direction to reverse the direction of relativemovement of said coils and 16. In apparatus of the character describedcomprising a motive device including a plurality of solenoid coils, asolenoid plunger having alternate magnetic and non-magnetic sections,said kcoils and plunger being mounted `for` relative movement, means forenergizing and de-ene'rgizing said solenoid coils in predeterminedsequence comprising a plurality of control windings, means operable inresponse to the relative movement f said coils and plunger to vary thecurrent in said windings, respectively, and means operable in responseto the current in said windings for connecting and disconnecting thesolenoid coils to and from a source of current.

17. In apparatus of the character described comprising a, motive deviceincluding a plurality of solenoidcoils, a solenoid plunger havingalternate magnetic and non-magnetic sections, said coils and plungerbeing mounted for relative movement, means for energizing andde-energizing said solenoid coils in predetermined sequence comprising aplurality of control windings, means operable in response to therelative movement of said coils and plunger to vary the current in saidwindings, respectively, and means operable in response to the current insaid windings for connecting and disconnecting the solenoid coils to andfrom a source of current, and means automatically operative in responseto a predetermined relative movement oi said coils and plunger in onedirection to reverse the direction of relative movement of said coilsand plunger.

18, In apparatus o f the character described comprising a motive deviceincluding a plurality of solenoid coils, a solenoid plunger havingalternate magnetic and non-magnetic sections, said coils and plungerbeing mounted for relative movement, means for energizing andde-energizing said solenoid coils in predetermined sequence comprising aplurality of control windings, means operable in response to therelative movement of said coils and plunger to vary the current in saidwindings, respectively, and means operable in response to the current insaid windings for connecting and disconnecting the solenoid coils to andfrom a source of current, said last mentioned means comprising aplurality of relays each provided with contacts engageable with anddisengageable from each other for effecting said connection anddisconnection of the coil of a companion solenoid.

19. In apparatus of the character described comprising a motive deviceincluding a plurality of solenoid coils, a solenoid plunger havingalter'- nate magnetic and non-magnetic sections, said coils and plungerbeing mounted for relative movement, means for energizing andde-energizing said solenoid coils in predetermined sequence comprising aplurality of control windings, means operable in response to therelative movement of said coils and plunger to vary the current in saidwindings, respectively, and means operable in response to the current insaid windings for connecting and disconnecting the solenoid coils to andfrom a source of current, said last mentioned means comprising aplurality of relays each provided with contacts engageable with anddisengageable from each other for effecting said connection anddisconnection of the coil of a companion solenoid, said relays beingalso provided with contacts engageable with and disengageable from eachother for connecting and disconnecting said control windings to a sourceof current.

20. In apparatus of the character described comprising a motive deviceincluding a plurality of solenoid. coils, a solenoid plunger havingalternate magnetic and non-magnetic sections, said coils and plungerbeing mounted for relative movement, means for energizing andde-energizing said solenoid coils in predetermined sequence comprising aplurality of control windings, means operable in response to therelative movement of said coils and plunger to vary the current in saidwindings. respectively, and means operable in response to the current insaid windings for connecting and disconnecting the solenoid coils to andfrom a source of current, said last mentioned means comprising aplurality of relays each provided with contacts engageable with anddisengageable from each other for effecting said connection anddisconnection of the coil of a companion solenoid, and meansautomatically operative in response to a predetermined relative movementof said coils and plunger in one direction to reverse the direction ofrelative movement of said coils and plunger.

21. In apparatus of the character described comprising a motive deviceincluding a plurality of solenoid coils, a solenoid plunger havingalternate magnetic and non-magnetic sections, said coils and plungerbeing mounted for relative movement, means for energizing andde-energizing said solenoid coils in predetermined sequence comprising aplurality of control windings, means 596ml HOOm operable in response tothe relative movement of said coils and plunger to vary the current insaid windings, respectively, and means operable in response to thecurrent in said windings for connecting and disconnecting the solenoidcoils to and from a source of current, said last mentioned meanscomprising a plurality of relays each provided with contacts engageablewith and disengageable from each other for eiecting said connection anddisconnection of the coil of a companion solenoid, said relays beingalso provided with contacts engageable with and disengageable from eachother for connecting and disconnecting said control windings to a sourceof current, and means automatically operative in response to apredetermined relative movement of said coils and plunger in onedirection to reverse the direction of relative movement of said coilsand plunger.

FREDERICK C. FISHER.

